Hand lamp



Feb. 17, 1942. w. R. KOPP 2,273,114

HAND LAMP Filed March 20, 1941 INVENTOR Waller 7?. /f0 0 BY I ATTORNEYSPatented Feb. 17, 1942 UNITED STATES v OFFICE HAND LAMP Walter R. Kopp,New Haven, Conn.,,assignor to Western Cartridge Company, New Haven,Conn, a corporation of Delaware Application March 20, 1941, Serial No.384,281

4 Claims.

This invention relates to hand lamps and more particularly to asupporting device for a hand lamp bulb.

In the older construction of hand lamps the lamp bulb is provided with athreaded stem and the casing is provided with a threaded socket toreceive the stem of the bulb. The newer hand lamp bulb of the prefocusedtype is provided with a lateral flange surrounding the stem and thisflange engages a seat on the reflector to hold the bulb in position.Suitable means are provided for maintaining the flange of the bulbagainst the seat of the reflector. The seat must be accuratelypositioned to dispose the lamp portion of the bulb in the proper placewithin the micetor for focusing.

The present invention comprises an adapter to permit the use of bulbshaving threaded stems with hand lamps built to receive bulbs of theprefocused type. In carrying out the invention I provide an internallythreaded sleeve which is adapted to receive the threaded stem of thelamp bulb and which is provided with a flange adapted to engage the seatformed on the reflector. Because of the threaded connection between theadapter and the lamp bulb the lamp bulb may be properly adjusted forfocusing. The lamp bulb is retained in position by means of a cup-shapedmember wihch is threaded to the reflector, the base of which bearsagainst the base of the lamp bulb to hold it in position. The base ofthe cupshaped member is in turn provided with an opening through whichthe base terminal of the bulb projects to engage the central electrodeof the upper cell of the battery.

In the accompanying drawing I have shown one embodiment of theinvention. In this showing:

Fig. 1 is a longitudinal, sectional view of the end of a hand lampcasing showing the invention applied;

Fig. 2 is a similar view of a portion of the reflector;

Fig. 3 is a detailed view of the lamp bulb and adapter; and

Fig. 4 is a sectional View of the cup-shaped member.

Referring to Fig. 1 of the drawing the reference numeral I designatesgenerally a portion of a hand lamp casing having a flared upper end 2and having a battery therein consisting of one or more cells, the end ofthe upper cell being shown at 3. The cell is provided with a centralelectrode 4 which is adapted to be engaged by the base terminal of alamp bulbin the usual man- (c1. arc-miss) ner. The enlarged head of thecasing is threaded as at 6 and is provided with a flange I. A reflector8 is provided with a peripheral flange 9 which is adapted to besupported by the flange I. A ring II) of insulating material may bearranged around the flange of the reflector. A lens II is arranged onthe flange of the reflector. The reflector and lens are retained inposition by an end cap I'2 which is internally threaded to engage thethreads 6 on the end of the casing.

The reflector is constructed to receive a bulb of the prefocused type.As shown it is provided with a central opening I3. An externallythreaded member I4 is secured to the reflector around this opening. Asshown the member III is provided with a portion I5 of reduced diameterand the portion I5 has an inwardly extending flange It on its end. Thematerial of the reflector around the opening I3 is spun over this flangeas indicated at H. Between the threaded portion i4 and the portion I5 ofreduced diameter the shoulder I4 forms a seat for the reception of theflange arranged on the stem of a bulb of the prefocused type.

The adapter shown in detail in Fig. 3 of the drawing consists of aninternally threaded sleeve I8 having a flange I9 on one end. Thisadapter receives a bulb 20 having a threaded stem 2|. The bulb isprovided with a central terminal 22 connected to one end of the filamentby a suitable lead wire (not shown) and the other terminal is connectedto the threaded shell 2I by suitable lead wire as is usual in theconstruction of bulbs of this type. The lead wires are embedded ininsulating material within the shell and this insulating material isexposed at the bottom of the stem around the central terminal asindicated at 23.

When the bulb and. adapter are in position in the lamp as shown in Fig.1, the flange I9 of the adapter engaging the seat I4 limits the forwardmovement of the bulb into the reflector. The cup-shaped member shown inFig. 4 of the drawing engages the base of the bulb to retain it inposition and retain the flange I9 against the seat I4. As shown thecup-shaped member comprises an internally threaded sleeve 24 whichengages the threads I4. The bottom of the cup-shaped member is providedwith an inclined portion 25 and a substantially horizontal portion 26.This horizontal portion 26 is provided with a central opening 27. Thebase terminal of the bulb projects through the opening 21 to engage thecentral terminal 4 of the battery. The other terminal of the battery isconnected to the outer terminal of the lamp bulb by a movable switchmember 28 which is adapted to be moved in and out of contact with thereflector by any suitable switch means (not shown) mounted on thecasing. To prevent short circuiting of the lamp it is thus necessary toinsulate the cup-shaped member 24 from the central terminal. Theindented portion in the bottom of the cup-shaped member formed by theinclined wall 25 is provided for this purpose and the horizontal portion26 of the cup-shaped member surrounding the opening engages theinsulation 23 and is thus insulated from the central terminal 22 of thelamp bulb.

It will be apparent that the construction described thus provides a verysimple means for,

mounting a lamp bulb having a threaded stemin a hand lamp reflectorbuilt for the reception of a bulb of the preiocused type. In employingprefocused bulbs it is necessary that the seat I45 be very accuratelypositioned to arrange the lamp portion of the bulb; in focuslwhen it ismounted in the reflector. In-employingthe pres.- ent construction withthe typeof bulb disclosed, thisis not necessary because the bulb; maybeadjusted in the adapter, due to the threaded.

engagement to bring it into focus when itisarrangedin the reflector.

I claim:

1; A hand lamp comprising areflector havinga central opening and. havinga seat formedadjacent the opening, a threaded sleeve having a flangeengaging the seat, a lamp bulb having a threaded stem received in thesleeve, the bulb having a terminal on the end of the stem, and acup-shaped member connected to the reflector and engaging a portionofthebase ofthe lamp bulb to exert an axial pressure on it and retain it inposition, the cup-shaped member having acentral opening through whichthe base terminal of the lamp projects.

2. A hand lamp comprising a: reflector having a central opening andhaving a-seat formed-adjacent the opening, a threaded sleeve having aflange engaging the seat, a lamp bulb having a threaded stem received inthe sleeve, the bulb having a terminal on the end of the stem, and acup-shaped member connected to the reflector and engaging the base ofthe lamp bulb stem to retain the lamp bulb in position, the bottom ofthe cup-shaped member being inclined inwardly adjacent its periphery andbeing provided with a central opening through which the base terminalofv the lamp bulb projects.

3. A hand lamp comprising a reflector having a central opening, anexternally threaded cylindrical member secured to the reflector adjacentthe opening, said. member being provided with a seat, a threaded sleevehaving a flange engaging the seat, a lamp bulb having a threaded stemreceived in the sleeve, the lamp bulb having a terminal on the base ofthe stem, and a cup-shaped member connected to the cylindrical memberand engaging a. portion of the base of the lamp bulb to exert an axialpressure on it and retain the lamp bulb in position, the cup-shapedmember bein provided with a central opening through which the baseterminal of the lamp bulb projects.

4;, A hand lamp comprising. a reflector having a centralopening, anexternally threaded cylindricalmember; securedv to the reflectoradjacent the opening, said-member being provided with a seat, a threadedsleeve having a flange engaging the: seat, a lamp bulb having a threadedstem reoeived, in the sleeve, the lamp bulb having a terminalonthe baseof the stem, and a cup-shaped member connected to, the cylindricalmember and engaging a portion of the base of the-lamp bulb to; retainthe lamp bulb in position, the bottom of cup-shaped member beinginclined inwardly adjacent its periphery and beingprovided with acentralopening through which the base terminal of-the lamp bulbprojects.

WALTER R. KOPP.

